Alan Watts - The I That Eyes Everything Is Nothing (SHOTS OF WISDOM 60)

Most people don't have a clue how it feels to be dead or what the state of consciousness after death looks like. While many imagine it as eternal darkness or being buried alive, Watts argues it would be quite different. He contemplates the idea of returning to a state of non-existence after death. Just as we have no memory of what existed before our birth, there is nothingness. However, if something (in this case existence) happened once, it could potentially happen again, suggesting the theoretical possibility of reemergence after death.
Alan Watts seems to suggest here that the state in between different existences doesn't differ from the state of dreamless sleep. We can't know it or describe it because it contains nothing. It is in fact pure nothingness. This Nothingness is the very nature of the Self, the origin of all manifestations.